Error in Nested SubQuery In DQL: Class '(' is not defined

doctrine, doctrine-orm, dql, mysql, php

Solution

Use the `createSubquery()` function to create a subquery in Doctrine. You can then nest the subquery into your main query.

Example

// build root query
$query = Doctrine_Query::create()
  ->from('Movie m')
  ->where('name = ?', 'Prometheus')
;

// build subquery
$subquery = $query->createSubquery()
  ->from('SeenMovie sm')
  ->where('m.name = sm.name')
;

// nest subquery and execute
$query->where('EXISTS (' . $subquery->getDql() . ')')->execute();

Further Reading A Bulletproof Pattern for Creating Doctrine Subqueries of Any Complexity

Problem

I have a DQL as like below: ``` SELECT at, count(at.id) FROM AccountTriple at JOIN at.property p JOIN at.account ac WHERE p.create_analytics = '1' GROUP BY at.property, at.value, ac.service ``` As you can see, it has three joins. As 'at' and 'ac' both have large amount of data. In attempt to optimize it, I am trying to move the "p.create_analytics = '1'" checking before join to 'ac' to give it a smaller data set to join. I am trying to achieve something like this: ``` SELECT at, count(at.id) FROM ( SELECT at FROM AccountTriple at JOIN at.property p WHERE p.create_analytics = '1' ) JOIN at.account ac GROUP BY at.property, at.value, ac.service ``` But somehow, my syntax isn't working. A error message is showing as below: Semantical Error] line 0, col 29 near '( SELECT at FROM': Error: Class '(' is not defined. Didn't find similar example anywhere else as well. Does anyone can help to fix this DQL query to get working? Thanks in advance.

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